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Nonsteroidal Anti Inflammatory Drugs (Nsaids) DRUG ACTING on CNS (PHARMACOLOGY)

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Nonsteroidal Anti Inflammatory Drugs (Nsaids) DRUG ACTING on CNS (PHARMACOLOGY) Nonsteroidal Anti inflammatory Drugs (NSAIDs) DRUG ACTING ON CNS (PHARMACOLOGY) Unit 5 (2) The clinical features of inflammation have been recognized since ancient times as swelling, redness, pain, and heat. The underlying mechanisms which produce these symptoms are complex, involving many different cells and cell products. A normal inflammatory response is essential to fight infections and is part of the repair mechanism and removal of debris following tissue damage. Inflammation can also cause disease, due to damage of healthy tissue. This may occur if the response is over- vigorous, or persists longer than is necessary. Additionally, some conditions have a previously unrecognized inflammatory component, e.g. atherosclerosis. The inflammatory response occurs in vascularised tissues in response to injury. It is part of the innate nonspecific immune response. Inflammatory responses require activation of leukocytes: neutrophils, eosinophils, basophils, mast cells, monocytes, and lymphocytes, although not all cell types need be involved in an inflammatory episode. The cells migrate to the area of tissue damage from the systemic circulation and become activated. Diseases with a chronic inflammatory component Inflammatory disease Inflammatory cell infiltrate Acute respiratory distress Neutrophil syndrome Bronchial asthma Eosinophil,T cell, monocyte, basophil Atherosclerosis T cell, monocyte Glomerulonephritis Monocyte,T cell, neutrophil Inflammatory bowel disease Monocyte, neutrophil,T cell, eosinophil Osteoarthritis Monocyte, neutrophil Psoriasis T cell, neutrophil Rheumatoid arthritis Monocyte, neutrophil Sarcoidosis T cell, monocyte Inflammatory mediators Activated leukocytes at a site of inflammation release compounds which enhance the inflammatory response mainly cytokines and eicosanoids (arachidonic acid metabolites). But the complexity of the response is indicated by the range of many mediators: complement products, kinins (bradykinin) and the contact system (coagulation factors XI and XII, pre-kallikrein, high molecular weight kininogen); nitric oxide and vasoactive amines (histamine, serotonin and adenosine); activated forms of oxygen; platelet activating factor (PAF); metalloproteinases (collagenases, gelatinases, and proteoglycanase), etc. Cytokines (ILs, TNFs, IFNs, CSFs, etc.) are peptides regulating cell growth, differentiation, and activation, and some have therapeutic value: • IL-1 plays a part in the sepsis syndrome and rheumatoid arthritis, and successful blockade of its receptor offers a therapeutic approach for these conditions. • TNFα is similar to IL-1. Agents that block him, e.g. etanercept, infliximab are finding their place among Disease modifying antirheumatic drugs. The main cell and inflammatory cytokines in chronic inflammatory diseases Clinical Pharmacology – 9th Ed. (2003) Eicosanoids (prostaglandins, thromboxanes, leukotrienes, lipoxins) is the name given to a group of 20-carbon unsaturated fatty acids, derived principally from arachidonic acid in cell walls. They are short-lived, extremely potent, and formed in almost every tissue in the body. Eicosanoids are involved in most types of inflammation and it is on manipulation of their biosynthesis that most current antiinflammatory therapy is based. Their biosynthetic paths appear in the next slides. Inflammatory stimulus (+) Ex Phospholipids Phospholipase A2 In Arachidonic acid Cyclooxy genase (COX) 5-lipoxygenase 15-lipoxygenase Endoperoxides Leucotrienes Lipoxins PGs TxA2 PROSTANOIDS (PGs & Txs) PGI2 (prostacyclin) is located predominantly in vascular endothelium. Main effects: •vasodilatation •inhibition of platelet aggregation TxA2 is found in the platelets. Main effects: •platelet aggregation •vasoconstriction PGE2 causes: • inhibition of gastric acid secretion •contraction of pregnant uterus •contraction of GI smooth muscles PGF2α – main effects: •contraction of bronchi •contraction of miometrium Cyclooxygenase (COX) is found bound to the endoplasmatic reticulum. It exists in 3 isoforms: • COX-1 (constitutive) acts in physiological conditions. • COX-2 (inducible) is induced in inflammatory cells by pathological stimulus. • COX-3 (in brain). Essential of Medical Pharmacology – 5st Ed. (2003) COX inhibitors Nonselective NSAIDs COX-1/COX-2 inhibitors COX-2 COX-3 inhibitors inhibitors • Selective (coxibs) •Antipyretic • Preferential analgesics Nonselective COX-1/COX-2 inhibitors (Classical NSAIDs) •Salicylates •Phenylacetates •Indolacetates •Enolates De rivatives •Fenamates of acid •Propionates •Butylpyrazolidindiones •Pyrazolones Nonselective COX-1/COX-2 inhibitors DERIVATIVES OF ACIDS Salicylates Acetylsalicylic acid (Aspirin®, 1899), Diflunisal Methyl salicylate (revulsive drug) Phenylacetates: Acelcofenac, Diclofenac Indolacetates: Indometacin, Sulindac Enolates (oxicams) Piroxicam, Piroxicam beta-cyclodextrin (prodrug), Lornoxicam, Tenoxicam Propionates Flurbiprofen, Ibuprofen, Ketoprofen, Naproxen OTHERS (with less application) Pyrazolones: Phenazone, Propyphenazone, etc. Pyrazolidinediones: Oxyphenbutazone, Phenylbutazone Beneficial actions of NSAIDs due to prostanoid synthesis inhibition 1. Analgesia prevention of pain nerve ending sensitization 2. Antipyresis connected with influence of thermoregulatory centre in the hypothalamus 3. Antiinflammatory action mainly antiexudative effect 4. Antithrombotic action in very low daily doses 5. Closure of ductus arteriosus Shared toxicities of NSAIDs due to prostanoid synthesis inhibition 1. Gastric mucosal damage connected with PGE inhibition 2. Bleeding: inhibition of platelet function (TxA2 synthesis) 3. Limitation of renal blood flow Na+ and water retention 4. Delay / prolongation of labour connected with PGF2α inhibition 5. Asthma and anaphylactoid reactions connected with PGF2α inhibition Mechanisms by which NSAIDs may induce mucosal injury Lüllmann, Color Atlas of Pharmacology – 2nd Ed. (2000) Lüllmann, Color Atlas of Pharmacology – 2nd Ed. (2000) Lüllmann, Color Atlas of Pharmacology – 2nd Ed. (2000) Metabolism of Aspirin Basic & Clinical Pharmacology – 10th Ed. (2007) Salicylic acid Cortex Aspirin Salicis albae (1899) Effects of NSAIDs 1. Analgesic and antipyretic action Aspirin is a weaker analgesic than morphine-type drugs Aspirin 600 mg < Codeine 60 mg < 6 mg Morphine Aspirin relieves inflammatory, tissue injury related, connective tissue and integumental pain but is rela- tively ineffective in severe visceral and ischemic pain. The analgesic action is mainly due to obtunding perip- heral pain receptors and prevention of PG mediated sensitization of nerve endings. A central subcortical action, raising threshold to pain perception also contri- butes. No sedation, tolerance, and dependence are produced. Aspirin resets the hypothalamic thermostat and rapidly reduces fever by promoting heat loss (swea- ting, cutaneous vasodilation), but does not decrease heat production. 2. Antiinflammatory action is exerted at high daily doses of Aspirin (3 to 6 g). Clinical symptoms of inflam- mation are suppressed, but prolongation of the under- lying disease in rheumatoid arthritis, rheumatic fever, and osteoarthritis is not affect. 3. Inhibition of platelet aggregation in low doses (75–100 mg/24 h Aspirin). 4. Metabolic effects of Aspirin and other NSAIDs are significant only at antiinflammatory doses. Cellular metabolism is increased, especially in skeletal muscles, due to uncoupling of oxidative phosphorylation as a result of increased heat production. There is increased utilization of glucose and blood sugar may decrease (specially in diabetics) and liver glycogen is depleted. However, hyperglycemia is often seen at toxic doses: this is due to central sympathetic stimulation and release of adrenaline and GCS. Chronic use of large doses cause negative nitrogen balance by increased conversion of protein to carbohydrate. Plasma free fatty and cholesterol are reduced. 5. Respirations. At antiinflammatory doses respiration is stimulated by peripheral (increased CO2 production) and central (increased sensitivity of respiratory centre to CO2) action. Hyperventilation is prominent in salicy- late poisoning. Further raise in the salicylate level causes respiratory depression and failure, and death. 6. Acid-base and electrolyte balance. Antiinflammatory doses produce significant changes. Initially respiratory stimulation predominates and tends to wash out CO2 despite increased production and the result is respiratory alkalosis, which is compensated by increased renal - + + excretion of HCO3 (with accompanying Na , K , and water). Most adults treated with 4–6 g/daily of Aspirin stay in a state of compensated respiratory alkalosis. Still higher doses cause respiratory depression with CO2 retention, while excess CO2 production continues to develop respiratory acidosis. To this are added dis- sociated salicylic acid as well as metabolic acid (because there is rebound depression). It develops uncompensated metabolic acidosis. Dehydration occurs in poisoning due to increased water loss in urine. 7. CVS. Larger doses of Aspirin increase cardiac output to meet increased peripheral oxygen demand and cause direct vasodilatation. Toxic doses depress vaso- motor centre: BP falls. Because of increased cardiac work as well as sodium and water retention, CHF my develop if the heart reserves are low. 8. GIT. Aspirin and its metabolite salicylic acid irritate gastric mucosa and cause epigastralgia, nausea, and vomiting. In higher doses it also stimulates CTZ. Aspirin (pKa 3.5) remains unionized and diffusible in the
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